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On 4/14/26 17:49, Tvrtko Ursulin wrote:
> Trace_dma_fence_signaled, trace_dma_fence_wait_end and
> trace_dma_fence_destroy can all currently dereference a null fence->ops
> pointer after it has been reset on fence signalling.
>
> Lets use the safe string getters for most tracepoints to avoid this class
> of a problem, while for the signal tracepoint we move it to before ops are
> cleared to avoid losing the driver and timeline name information. Apart
> from moving it we also need to add a new tracepoint class to bypass the
> safe name getters since the signaled bit is already set.
>
> For dma_fence_init we also need to use the new tracepoint class since the
> rcu read lock is not held there, and we can do the same for the enable
> signaling since there we are certain the fence cannot be signaled while
> we are holding the lock and have even validated the fence->ops.
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin(a)igalia.com>
> Fixes: 541c8f2468b9 ("dma-buf: detach fence ops on signal v3")
> Cc: Christian König <christian.koenig(a)amd.com>
> Cc: Philipp Stanner <phasta(a)kernel.org>
> Cc: Boris Brezillon <boris.brezillon(a)collabora.com>
> Cc: linux-media(a)vger.kernel.org
> Cc: linaro-mm-sig(a)lists.linaro.org
> ---
> drivers/dma-buf/dma-fence.c | 3 ++-
> include/trace/events/dma_fence.h | 33 ++++++++++++++++++++++++++++----
> 2 files changed, 31 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
> index a2aa82f4eedd..b3bfa6943a8e 100644
> --- a/drivers/dma-buf/dma-fence.c
> +++ b/drivers/dma-buf/dma-fence.c
> @@ -363,6 +363,8 @@ void dma_fence_signal_timestamp_locked(struct dma_fence *fence,
> &fence->flags)))
> return;
>
> + trace_dma_fence_signaled(fence);
> +
> /*
> * When neither a release nor a wait operation is specified set the ops
> * pointer to NULL to allow the fence structure to become independent
> @@ -377,7 +379,6 @@ void dma_fence_signal_timestamp_locked(struct dma_fence *fence,
>
> fence->timestamp = timestamp;
> set_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags);
> - trace_dma_fence_signaled(fence);
I think this part here should be a separate patch.
>
> list_for_each_entry_safe(cur, tmp, &cb_list, node) {
> INIT_LIST_HEAD(&cur->node);
> diff --git a/include/trace/events/dma_fence.h b/include/trace/events/dma_fence.h
> index 3abba45c0601..9e0cb9ce2388 100644
> --- a/include/trace/events/dma_fence.h
> +++ b/include/trace/events/dma_fence.h
> @@ -9,12 +9,37 @@
>
> struct dma_fence;
>
> +DECLARE_EVENT_CLASS(dma_fence,
> +
> + TP_PROTO(struct dma_fence *fence),
> +
> + TP_ARGS(fence),
> +
> + TP_STRUCT__entry(
> + __string(driver, dma_fence_driver_name(fence))
> + __string(timeline, dma_fence_timeline_name(fence))
> + __field(unsigned int, context)
> + __field(unsigned int, seqno)
> + ),
> +
> + TP_fast_assign(
> + __assign_str(driver);
> + __assign_str(timeline);
> + __entry->context = fence->context;
> + __entry->seqno = fence->seqno;
> + ),
> +
> + TP_printk("driver=%s timeline=%s context=%u seqno=%u",
> + __get_str(driver), __get_str(timeline), __entry->context,
> + __entry->seqno)
> +);
> +
Mhm, I'm strongly in favor to just use this approach for all trace points.
The minimal extra overhead shouldn't really matter at all.
Regards,
Christian.
> /*
> * Safe only for call sites which are guaranteed to not race with fence
> * signaling,holding the fence->lock and having checked for not signaled, or the
> * signaling path itself.
> */
> -DECLARE_EVENT_CLASS(dma_fence,
> +DECLARE_EVENT_CLASS(dma_fence_ops,
>
> TP_PROTO(struct dma_fence *fence),
>
> @@ -46,7 +71,7 @@ DEFINE_EVENT(dma_fence, dma_fence_emit,
> TP_ARGS(fence)
> );
>
> -DEFINE_EVENT(dma_fence, dma_fence_init,
> +DEFINE_EVENT(dma_fence_ops, dma_fence_init,
>
> TP_PROTO(struct dma_fence *fence),
>
> @@ -60,14 +85,14 @@ DEFINE_EVENT(dma_fence, dma_fence_destroy,
> TP_ARGS(fence)
> );
>
> -DEFINE_EVENT(dma_fence, dma_fence_enable_signal,
> +DEFINE_EVENT(dma_fence_ops, dma_fence_enable_signal,
>
> TP_PROTO(struct dma_fence *fence),
>
> TP_ARGS(fence)
> );
>
> -DEFINE_EVENT(dma_fence, dma_fence_signaled,
> +DEFINE_EVENT(dma_fence_ops, dma_fence_signaled,
>
> TP_PROTO(struct dma_fence *fence),
>
On 4/14/26 12:55, popov.nkv(a)gmail.com wrote:
> From: Vladimir Popov <popov.nkv(a)gmail.com>
>
> If vmw_execbuf_fence_commands() call fails in
> vmw_kms_helper_validation_finish(), it sets *p_fence = NULL. If
> ctx->bo_list is not empty, the caller, vmw_kms_helper_validation_finish(),
> passes the fence through a chain of functions to dma_fence_is_array(),
> which causes a NULL pointer dereference in dma_fence_is_array():
>
> vmw_kms_helper_validation_finish() // pass NULL fence
> vmw_validation_done()
> vmw_validation_bo_fence()
> ttm_eu_fence_buffer_objects() // pass NULL fence
> dma_resv_add_fence()
> dma_fence_is_container()
> dma_fence_is_array() // NULL deref
Well good catch, but that is clearly not the right fix.
I'm not an expert for the vmwgfx code but in case of an error vmw_validation_revert() should be called an not vmw_kms_helper_validation_finish().
Regards,
Christian.
>
> Fix this by adding a NULL check in vmw_validation_bo_fence(): if the fence
> is NULL, fall back to ttm_eu_backoff_reservation()to safely release
> the buffer object reservations without attempting to add a NULL fence to
> dma_resv. This is safe because when fence is NULL, vmw_fallback_wait()
> has already been called inside vmw_execbuf_fence_commands() to synchronize
> the GPU.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Fixes: 038ecc503236 ("drm/vmwgfx: Add a validation module v2")
> Cc: stable(a)vger.kernel.org
> Signed-off-by: Vladimir Popov <popov.nkv(a)gmail.com>
> ---
> drivers/gpu/drm/vmwgfx/vmwgfx_validation.h | 13 ++++++++++---
> 1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h
> index 353d837907d8..fc04555ca505 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_validation.h
> @@ -127,16 +127,23 @@ vmw_validation_bo_reserve(struct vmw_validation_context *ctx,
> * vmw_validation_bo_fence - Unreserve and fence buffer objects registered
> * with a validation context
> * @ctx: The validation context
> + * @fence: Fence with which to fence all buffer objects taking part in the
> + * command submission.
> *
> * This function unreserves the buffer objects previously reserved using
> - * vmw_validation_bo_reserve, and fences them with a fence object.
> + * vmw_validation_bo_reserve, and fences them with a fence object if the
> + * given fence object is not NULL.
> */
> static inline void
> vmw_validation_bo_fence(struct vmw_validation_context *ctx,
> struct vmw_fence_obj *fence)
> {
> - ttm_eu_fence_buffer_objects(&ctx->ticket, &ctx->bo_list,
> - (void *) fence);
> + /* fence is able to be NULL if vmw_execbuf_fence_commands() fails */
> + if (fence)
> + ttm_eu_fence_buffer_objects(&ctx->ticket, &ctx->bo_list,
> + (void *)fence);
> + else
> + ttm_eu_backoff_reservation(&ctx->ticket, &ctx->bo_list);
> }
>
> /**
> --
> 2.43.0
>
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On 4/9/26 14:38, Andi Shyti wrote:
> Hi Christian,
>
>> @@ -845,9 +845,8 @@ void dma_buf_put(struct dma_buf *dmabuf)
>> if (WARN_ON(!dmabuf || !dmabuf->file))
>> return;
>>
>> - fput(dmabuf->file);
>> -
>> DMA_BUF_TRACE(trace_dma_buf_put, dmabuf);
>> + fput(dmabuf->file);
>
> funny, I just found out I sent the exact same patch, just few
> minutes later :-) [*]
I liked your patch better since it has more accurate tags.
Just reviewed and pushed that one to drm-misc-fixes, should land upstream by the end of the week.
Regards,
Christian.
>
> Andi
>
>> }
>
> [*] https://lore.kernel.org/all/20260408123916.2604101-2-andi.shyti@kernel.org/